What is a BGP Peer group and why do we need it? How do you configure it?

BGP creates updates, by default, on a neighbor-by-neighbor bases. We can put the neighbors into BGP peer groups and apply some parameters to the peer group, so it will be applied to the group and not one-by-one. this can decrease the CPU usage.

Influencing an Enterprise’s Inbound Routes with MED

What is MED?

Multi Exit Discriminator: BGP send the MED PA to it’s neighbor (eBGP). It’s usually used in multi-homed designs. With MED the engineer can configure where should the traffic enter into the enterprise. Smaller MED value the better.
If the enterprise want MED to work properly, they need to communicate with the ISP to rely on MED. Else the other BGP tie breakers will win before MED.